I have a 55 gal tank with 2) 23 inch light strips. The plastic that holds the bulb in place has all melted and is cracking away. I replaced one of the light strips a couple weeks ago with a used one I found at the local pet store. Now, I cannot find another one that's 23 inches. Seems they don't make them anymore. Can you buy the plastic housing that holds the bulbs in place? Thanks!